<template>
  <div
    class="todo-footer"
    v-show="total"
  >
    <label>
      <!-- <input
        type="checkbox"
       :checked="isAll"
       @change="checkAll"
      /> -->

      <!-- v-model 双向绑定 -->
      <input
        type="checkbox"
        v-model="isAll"
      />
    </label>
    <span>
      <span>已完成{{  doneTotal }}</span> / 全部{{ total }}
    </span>
    <button
      class="btn btn-danger"
      @click="clearDone"
    >清除已完成任务</button>
  </div>
</template>

<script>
export default {
  name: 'MyFooter',
  props: ['todos', 'handleCheckAll', 'clearAll'],
  computed: {
    total() {
      return this.todos.length
    },
    doneTotal() {
      return this.todos.reduce((pre, current) => {
        // console.log('#', pre, current);
        return pre + (current.done ? 1 : 0)
      }, 0)
    },
    isAll: {
      get() {
        return this.total === this.doneTotal && this.total > 0
      },
      set(value) {
        console.log('#', value);
        this.todos.forEach(todo => {
          todo.done = value;
        })
      }
    }
  },
  data() {
    return {

    }
  },
  methods: {
    // checkAll(e) {
    //   // console.log(e);
    //   this.handleCheckAll(e.target.checked)
    // }

    //清除已完成任务
    clearDone(e) {
      this.clearAll(e)
    }
  }
}
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}
</style>